Great! It will save a lot of time as I do highlight in 2-3 different colors, to make a second review easier. Having several highlighters with different settings will save me quite a few clicks for every single act of highlighting.

About saving to PDF: See http://docs.kde.org/stable/en/kdegraphics/okular/annotations.html

"Since Okular 0.15 you can also save annotations directly into PDF files. This feature is only available if Okular has been built with version 0.20 or later of Poppler rendering library. You can use File → Save As... to save the copy of PDF file with annotations."

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Thanks for this awesome feature! I mainly use the highlighter and pop-up note with different colors, so it will definitely make Okular more pleasant to use.